8461931321 has 4 divisors (see below), whose sum is σ = 8462249700. Its totient is φ = 8461612944.

The previous prime is 8461931299. The next prime is 8461931327. The reversal of 8461931321 is 1231391648.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5046113296 + 3415818025 = 71036^2 + 58445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8461931321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8461931327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115286 + ... + 173823.

It is an arithmetic number, because the mean of its divisors is an integer number (2115562425).

Almost surely, 2^8461931321 is an apocalyptic number.

It is an amenable number.

8461931321 is a deficient number, since it is larger than the sum of its proper divisors (318379).

8461931321 is a wasteful number, since it uses less digits than its factorization.

8461931321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318378.

The product of its digits is 31104, while the sum is 38.

The square root of 8461931321 is about 91988.7564923018. The cubic root of 8461931321 is about 2037.7762614151.

The spelling of 8461931321 in words is "eight billion, four hundred sixty-one million, nine hundred thirty-one thousand, three hundred twenty-one".